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SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> METHOD 8020*** 8880 INTERCHANGE DRtVE <br /> HOUSTON, TEXAS 77054 <br /> PHONE(713)660-0901 <br /> queous Batch Id: HP S980120394800 f. <br /> Units: Pg/L <br /> L A B O R A T O R Y C 0 N T R 0 L S A M P L E <br /> S P I K E Method Spike Blank Spike QC Limits(**) <br /> C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> cl> % % Recovery Range <br /> MTBE ND 50 49 98.0 72 - 128 <br /> Renzene ND 50 51 102 61 - 119 <br /> Toluene ND 50 51 102 65 - 125 <br /> Ethyl_Benzene ND 50 49 98.0 70 - 118 <br /> O-xylene ND 50 51 102 72 - 117 <br /> M and P Xylene ND 100 102 102 72 - 116 <br /> M A T R I X S P I K E S <br /> S P I K E Sample Spike Matrix Spike Matrix Spike MS/MSD QC Limits(***) <br /> C O M P O U N D S Results Added Duplicate Relative % (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> c4> <1> c5> Max- Recovery Range <br /> MTBE 100 20 120 NC 120 NC NC 20 39 - 150 <br /> BENZENE 4.1 20 29 124 29 124 C 21 32 - 164 <br /> TOLUENE ND 20 25 125 25 125 0 20 38 - 159 - <br /> ETHYL BENZENE ND 20 23 115 24 120 4.26 19 52 - 142 <br /> O-XYLENE ND 20 24 120 25 125 4-08 18 53 - 143 <br /> M AND P XYLENE ND 40 47 118 So 125 5.76 17 53 - 144 <br /> * Values outside QC Range due to Matrix Interference (except RPD) <br /> Analyst: DN c = Data outside Method Specification limits. <br /> Sequence Date: 01/20/98 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked: 9801742-03A ND Not Detected/Below Detection Limit <br /> Sample File ID: S A3051,TX0 %, Recovery = [( cl> - <2> } / <3> ] x 100 <br /> Method Blank File ID: LCS I Recovery = (<1> / <3> ) x 100 <br /> Blank Spike File ID: S A3043.TXC Relative Percent Difference = I (c4> - <5> / [(<4> + c5> } x 0.5] x 100 <br /> Matrix Spike File ID: S A3046.TX0 {**} Source: SPL-Houston Historical Data (1ST Q 197) <br /> Matrix Spike Duplicate File ID: S_A3047.TXO (***1 = Source: SPL-Houston Historical Data (1ST Q 197) <br /> SAMPLES IN BATCH(SPL ID) : 9801744-06A 9801744-07A 9801585-10A 9801583-IOA <br /> 9801585-08A 9801585-09A 9801643-02A 9801643-01A <br /> 9801742-03A 9601744-OIA 9801744-04A 9801744-OSA <br />